const state = {
    visitedViews: [],
    cachedViews: [],
    iframeViews: []
};

const mutations = {
    ADD_IFRAME_VIEW: (state, view) => {
        if (state.iframeViews.some(v => v.path === view.path)) return;
        state.iframeViews.push(
            Object.assign({}, view, {
                title: view.meta.title || 'no-name'
            })
        );
    },
    ADD_VISITED_VIEW: (state, view) => {
        if (state.visitedViews.some(v => v.path === view.path)) return;
        state.visitedViews.push(
            Object.assign({}, view, {
                title: view.meta.title || 'no-name'
            })
        );
    },
    ADD_CACHED_VIEW: (state, view) => {
        if (state.cachedViews.includes(view.name)) return;
        if (view.meta && !view.meta.noCache) {
            state.cachedViews.push(view.name);
        }
    },
    DEL_VISITED_VIEW: (state, view) => {
        for (const [i, v] of state.visitedViews.entries()) {
            if (v.path === view.path) {
                state.visitedViews.splice(i, 1);
                break;
            }
        }
        state.iframeViews = state.iframeViews.filter(item => item.path !== view.path);
    },
    DEL_IFRAME_VIEW: (state, view) => {
        state.iframeViews = state.iframeViews.filter(item => item.path !== view.path);
    },
    DEL_CACHED_VIEW: (state, view) => {
        const index = state.cachedViews.indexOf(view.name);
        index > -1 && state.cachedViews.splice(index, 1);
    },

    DEL_OTHERS_VISITED_VIEWS: (state, view) => {
        state.visitedViews = state.visitedViews.filter(v => {
            return v.meta.affix || v.path === view.path;
        });
        state.iframeViews = state.iframeViews.filter(item => item.path === view.path);
    },
    DEL_OTHERS_CACHED_VIEWS: (state, view) => {
        const index = state.cachedViews.indexOf(view.name);
        if (index > -1) {
            state.cachedViews = state.cachedViews.slice(index, index + 1);
        } else {
            state.cachedViews = [];
        }
    },
    DEL_ALL_VISITED_VIEWS: state => {
        // keep affix tags
        const affixTags = state.visitedViews.filter(tag => tag.meta.affix);
        state.visitedViews = affixTags;
        state.iframeViews = [];
    },
    DEL_ALL_CACHED_VIEWS: state => {
        state.cachedViews = [];
    },

    TO_INDEC_DELALLVIEW: state => {
        // keep affix tags
        const affixTags = state.visitedViews.filter(tag => tag.meta.affix);
        state.visitedViews = affixTags;
    },

    UPDATE_VISITED_VIEW: (state, view) => {
        for (let v of state.visitedViews) {
            if (v.path === view.path) {
                v = Object.assign(v, view);
                break;
            }
        }
    },
    DEL_RIGHT_VIEWS: (state, view) => {
        const index = state.visitedViews.findIndex(v => v.path === view.path);
        if (index === -1) {
            return;
        }
        state.visitedViews = state.visitedViews.filter((item, idx) => {
            if (idx <= index || (item.meta && item.meta.affix)) {
                return true;
            }
            const i = state.cachedViews.indexOf(item.name);
            if (i > -1) {
                state.cachedViews.splice(i, 1);
            }
            if (item.meta.link) {
                const fi = state.iframeViews.findIndex(v => v.path === item.path);
                state.iframeViews.splice(fi, 1);
            }
            return false;
        });
    },
    DEL_LEFT_VIEWS: (state, view) => {
        const index = state.visitedViews.findIndex(v => v.path === view.path);
        if (index === -1) {
            return;
        }
        state.visitedViews = state.visitedViews.filter((item, idx) => {
            if (idx >= index || (item.meta && item.meta.affix)) {
                return true;
            }
            const i = state.cachedViews.indexOf(item.name);
            if (i > -1) {
                state.cachedViews.splice(i, 1);
            }
            if (item.meta.link) {
                const fi = state.iframeViews.findIndex(v => v.path === item.path);
                state.iframeViews.splice(fi, 1);
            }
            return false;
        });
    }
};

const actions = {
    addView({ dispatch }, view) {
        dispatch('addVisitedView', view);
        dispatch('addCachedView', view);
    },
    addIframeView({ commit }, view) {
        commit('ADD_IFRAME_VIEW', view);
    },
    addVisitedView({ commit }, view) {
        commit('ADD_VISITED_VIEW', view);
    },
    addCachedView({ commit }, view) {
        commit('ADD_CACHED_VIEW', view);
    },
    delView({ dispatch, state }, view) {
        return new Promise(resolve => {
            dispatch('delVisitedView', view);
            dispatch('delCachedView', view);
            resolve({
                visitedViews: [...state.visitedViews],
                cachedViews: [...state.cachedViews]
            });
        });
    },
    delVisitedView({ commit, state }, view) {
        return new Promise(resolve => {
            commit('DEL_VISITED_VIEW', view);
            resolve([...state.visitedViews]);
        });
    },
    delIframeView({ commit, state }, view) {
        return new Promise(resolve => {
            commit('DEL_IFRAME_VIEW', view);
            resolve([...state.iframeViews]);
        });
    },
    delCachedView({ commit, state }, view) {
        return new Promise(resolve => {
            commit('DEL_CACHED_VIEW', view);
            resolve([...state.cachedViews]);
        });
    },
    delOthersViews({ dispatch, state }, view) {
        return new Promise(resolve => {
            dispatch('delOthersVisitedViews', view);
            dispatch('delOthersCachedViews', view);
            resolve({
                visitedViews: [...state.visitedViews],
                cachedViews: [...state.cachedViews]
            });
        });
    },
    delOthersVisitedViews({ commit, state }, view) {
        return new Promise(resolve => {
            commit('DEL_OTHERS_VISITED_VIEWS', view);
            resolve([...state.visitedViews]);
        });
    },
    delOthersCachedViews({ commit, state }, view) {
        return new Promise(resolve => {
            commit('DEL_OTHERS_CACHED_VIEWS', view);
            resolve([...state.cachedViews]);
        });
    },
    delAllViews({ dispatch, state }, view) {
        return new Promise(resolve => {
            dispatch('delAllVisitedViews', view);
            dispatch('delAllCachedViews', view);
            resolve({
                visitedViews: [...state.visitedViews],
                cachedViews: [...state.cachedViews]
            });
        });
    },
    delAllVisitedViews({ commit, state }) {
        return new Promise(resolve => {
            commit('DEL_ALL_VISITED_VIEWS');
            resolve([...state.visitedViews]);
        });
    },
    delAllCachedViews({ commit, state }) {
        return new Promise(resolve => {
            commit('DEL_ALL_CACHED_VIEWS');
            resolve([...state.cachedViews]);
        });
    },
    updateVisitedView({ commit }, view) {
        commit('UPDATE_VISITED_VIEW', view);
    },
    delRightTags({ commit }, view) {
        return new Promise(resolve => {
            commit('DEL_RIGHT_VIEWS', view);
            resolve([...state.visitedViews]);
        });
    },
    delLeftTags({ commit }, view) {
        return new Promise(resolve => {
            commit('DEL_LEFT_VIEWS', view);
            resolve([...state.visitedViews]);
        });
    },
    toIndexdelAllView({ commit }) {
        return new Promise(resolve => {
            commit('TO_INDEC_DELALLVIEW');
            resolve([...state.visitedViews]);
        });
    }
};

export default {
    namespaced: true,
    state,
    mutations,
    actions
};
